I gotta say, even though Josh is pretty retarded he is 100% right. This is even a Box signature move, though everybody I've ever played with (the core group of ph vets like Enigma, Shineix, Streusel, Hawk, Dr Pinkerdroit, Gunner, etc etc etc) have done this as well. Sometimes you're one of 2 props left, and if you're on fire then its better to get the other guy killed so that you stop the health loss/extinguish yourself and get your scattergun back.
I think any upset should simply be countered with being ready. If you see somebody on fire charging right at you, hell you better be ready to move! Even if the dude isn't on fire but has a gang coming after him you should at least be alert. When you're trying to escape, its unrealistic to expect you don't run by/into other props. Nobody is that courteous and its just a part of the game.